JP7004168B2 - Vehicle power storage device - Google Patents

Description

The present invention relates to a vehicle power storage device mounted on a vehicle.

In recent years, it has been studied to replace a lead-acid battery with a lead-free lithium-ion secondary battery as a storage battery constituting a power storage device for auxiliary equipment mounted on a vehicle. Lithium-ion secondary batteries can be made smaller and lighter than lead-acid batteries with the same storage capacity, which contributes to weight reduction and improved running performance of vehicles.

For example, a square lithium-ion secondary battery is configured by enclosing a positive and negative electrode plate and an electrolytic solution in a rectangular parallelepiped case made of an aluminum alloy in a sealed manner, and has a certain degree of impact resistance. Then, a power storage device for auxiliary equipment is configured by a plurality of square lithium ion secondary batteries and arranged in the engine room.

The power storage device for auxiliary equipment arranged in the engine room is exposed to the air warmed by the heat of the engine during running, and drops to the outside air temperature when it is cold. The lithium-ion secondary battery constituting the power storage device has an operating temperature range in which its excellent performance can be exhibited, and charging / discharging outside this operating temperature range may not only exhibit its performance but also cause deterioration. Therefore, it is necessary to make the power storage device for auxiliary equipment less susceptible to the heat of the engine. Further, when the outside air temperature is lower than the lower limit temperature in the operating temperature range, it is necessary to heat the power storage device for auxiliary equipment so as to maintain the temperature within the operating temperature range.

On the other hand, there is increasing interest in electric vehicles (EVs) that do not emit carbon dioxide or the like while driving. The EV is equipped with a large-capacity power storage device composed of a plurality of lithium-ion secondary batteries in order to store electric power for traveling, and drives the drive wheels by rotationally driving an electric motor with the power supplied from the power storage device. Drive and drive. In addition, electric components such as braking devices, steering devices, headlights, and air conditioners are operated by the electric power of the power storage device. This power storage device is also less susceptible to the influence of the outside air temperature, and when the outside air temperature is lower than the lower limit temperature of the operating temperature range, it is necessary to heat the storage device so as to maintain the temperature within the operating temperature range. In addition, it is necessary to dissipate the heat generated by charging and discharging to maintain the temperature within the operating temperature range.

As a technique for heating a power storage device, for example, as in Patent Document 1, a technique for heating by a heater arranged on the bottom side of an aggregate of square storage batteries is known. Further, as in Patent Document 2, a technique is known in which a sheet-shaped heater is arranged between laminated type storage batteries in which positive electrode plates and negative electrode plates are alternately stacked via a separator and sealed with an insulating film. For cooling the power storage device, a technique for promoting heat dissipation from the surface of the storage battery by circulating the cooling air around the storage battery by a blower fan or the like is generally adopted.

Japanese Unexamined Patent Publication No. 2008-103207 Japanese Patent No. 56099799

When heating a power storage device composed of a square storage battery, the heater is arranged so as to be close to or in contact with the case as in Patent Document 1, and Joule heat generated by energization is transmitted to the case to heat the storage battery. It is difficult to efficiently heat the electrode plate as in Patent Document 2. Specifically, since there is a heat capacity of a case or the like other than the electrode plate, the heat of the heater is used for other than heating the positive and negative electrode plates.

Further, in order to prevent the heat of the heater from escaping and to reduce the influence of the outside air temperature, it is conceivable to cover the power storage device with a heat insulating member together with the heater. It was difficult to heat evenly, and there was room for improvement in heating the storage battery. On the other hand, cooling of the power storage device promotes heat dissipation from the surface of the case of the storage battery by cooling air, so that if the power storage device is covered with a heat insulating member together with the heater, heat dissipation is hindered and cooling cannot be performed.

An object of the present invention is to provide a vehicle power storage device capable of efficiently heating and cooling a storage battery.

The invention of claim 1 is a vehicle power storage device including a plurality of storage batteries having a rectangular parallelepiped-shaped case, wherein the case has a first side surface portion and a second side surface portion having a maximum side surface area, and the storage battery. A winding body in which a positive electrode plate and a negative electrode plate are wound flat around a horizontal axis via a separator and the outer periphery is covered with an insulating member, a heat insulating member covering the outer periphery of the winding body, and the above. A sheet-shaped heater disposed between the flat surface portion on the first side surface portion side and the heat insulating member of the pair of flat surface portions of the winding body, and the flat surface portion on the second side surface portion side. The case is characterized in that a heat pipe having a pair of heat absorbing portions abutting on both end portions in the horizontal axis direction and a heat radiating portion abutting on the inner wall of the first side surface portion is housed in the case. ..

According to the above configuration, the influence of the temperature on the outside of the winding body of the storage battery is reduced by the heat insulating member. Further, the winding body is heated from a wide eccentric flat portion by a sheet-shaped heater, and the heat of the heater is not dissipated by the heat insulating member. Moreover, since the heat absorbing portion of the heat pipe absorbs heat even when the heater is operated, a temperature gradient that promotes heat transfer to the winding body between the heater on the first side surface portion side and the pair of heat absorbing portions on the second side surface portion side. Can be generated to make it easier to warm the entire winding body. Moreover, when the winding body becomes hot due to charging and discharging, the heat can be efficiently transferred to the first side surface portion of the case by the heat pipe. Therefore, the storage battery can be efficiently heated and cooled.

According to a second aspect of the present invention, in the first aspect of the present invention, the heat pipe abuts on the inner wall of the bottom surface portion of the case from the pair of heat absorbing portions and extends toward the first side surface portion. It is characterized by being connected to.
According to the above configuration, it is possible to increase the heat dissipation area and realize efficient cooling by the heat pipe.

According to a third aspect of the present invention, in the first aspect of the present invention, the heat pipe has a third side surface portion and a fourth side surface portion of the case orthogonal to the horizontal axis of the winding body from the pair of heat absorbing portions. It is characterized in that it abuts on the inner wall of the above and extends toward the first side surface portion and is connected to the heat radiating portion.
According to the above configuration, a large heat dissipation area can be secured by a heat pipe having a simple shape, and efficient cooling of the storage battery can be realized.

The invention of claim 4 has a plurality of storage battery pairs composed of a pair of the storage batteries in which the second side surface portions are brought into close contact with each other in the invention of any one of claims 1 to 3, and these storage battery pairs. It is characterized in that the first side surface portion faces the cooling air passage formed by arranging the above in a row in the horizontal direction with a predetermined interval.
According to the above configuration, it is possible to promote heat dissipation from the first side surface portion and realize efficient cooling of the storage battery.

According to the vehicle power storage device of the present invention, the storage battery can be efficiently heated and cooled.

It is a block diagram explaining the structure of the vehicle which concerns on Example 1 of this invention. FIG. 3 is an exploded perspective view of a main part of the power storage device according to the first embodiment of the present invention. FIG. 3 is an exploded perspective view of a main part of a storage battery according to an embodiment of the present invention. FIG. 3 is a sectional view taken along line IV-IV of FIG. It is a perspective view which shows an example of a heat pipe. It is a perspective view which shows the other example of a heat pipe. It is a block diagram explaining the structure of the vehicle which concerns on Example 2 of this invention. It is an exploded perspective view of the main part of the power storage device which concerns on Example 2 of this invention. It is an exploded perspective view of the main part of the power storage module which concerns on Example 2 of this invention. 9 is a cross-sectional view taken along the line X-X of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to examples.

First, the configuration of the vehicle provided with the power storage device for the vehicle will be described with reference to FIG.
The vehicle has an engine 2 for driving the vehicle as a vehicle drive device 1, a starter motor 4 for starting the engine 2 as an auxiliary device 3, a blower fan 5 for introducing outside air into the engine room, and a driving force of the engine 2. It is equipped with various sensors including an alternator 6 and a temperature sensor 7 that generate power by using the above. Further, in the engine room, a power storage device 10 (vehicle power storage device) for storing electric power to be supplied to the engine 2, auxiliary equipment 3, and the like is provided. The vehicle is equipped with a control unit (ECU 8) that controls the engine 2, the auxiliary equipment 3, the power storage device 10, and the like.

The ECU 8 is composed of a computer including a CPU, a memory for storing various programs, an input / output device, and the like. The ECU 8 processes signals periodically output from various sensors, and outputs control signals for appropriately operating the engine 2, the blower fan 5, the power storage device 10, and the like. The ECU 8 manages the state of charge (SOC) of the power storage device 10 and drives the alternator 6 to charge the alternator 6 so as not to interfere with traveling.

Next, the power storage device 10 will be described.
The power storage device 10 is arranged in the engine room of the vehicle accommodating the engine 2. The engine 2 is cooled by, for example, a water-cooled cooling mechanism (not shown), and the heat released from the engine 2 warms the air in the engine room. This air is discharged to the outside together with the outside air introduced into the engine room by the traveling wind and the blower fan 5. The temperature sensor 7 detects the temperature of the power storage device 10 or its vicinity and outputs temperature data to the ECU 8, and the ECU 8 drives and sends a blower fan 5 to prevent an excessive temperature rise of the power storage device 10. Adjust the air volume.

The power storage device 10 is configured to connect a plurality of square lithium ion secondary batteries (storage batteries 20) in series to supply electric power to the auxiliary equipment 3 and the like. For example, as shown in FIG. 2, the power storage device 10 has four storage batteries 20, and a storage battery pair 21 in which the two storage batteries 20 are placed close to each other with an insulating separator 13 interposed therebetween is configured. Has 21.

A pair of support members 11 and a pair of end plates 12 are connected and fixed so as to maintain a state in which the two storage battery pairs 21 are aligned in the horizontal direction with a predetermined interval (for example, an interval of 10 mm). Has been done. A pair of support members 11 are equipped with a plurality of spacer members 11a for maintaining a predetermined distance between the two storage battery pairs 21 to secure a cooling air passage 17. These storage batteries 20 are connected in series by a plurality of bus bars 14, and are provided with positive electrode terminals 15 and negative electrode terminals 16 of the power storage device 10 at both ends thereof. Further, a cooling air passage is also provided between the end plate 12 and the storage battery 20. In addition, instead of forming the storage battery pair 21, for example, a power storage device 10 in which a plurality of storage batteries 20 are arranged at equal intervals to secure a cooling air passage between the storage batteries 20 can be configured.

Next, the storage battery 20 will be described with reference to FIGS. 3 to 5.
The storage battery 20 has a rectangular parallelepiped case 22, and a positive electrode terminal 23 and a negative electrode terminal 24 of the storage battery 20 are arranged on an upper surface portion 22a which is a lid member. The case 22 has a first side surface portion 22b and a second side surface portion 22c having the maximum side surface area parallel to each other, and a third side surface portion 22d orthogonal to and parallel to the first and second side surface portions 22b and 22c. It also has a fourth side surface portion 22e and a bottom surface portion 22f facing the upper surface portion 22a, and the inner walls thereof are insulated. Inside the case 22, the positive electrode plate 30a and the negative electrode plate 30b are wound flat around the horizontal axis via the porous separator 30c, and the outer periphery is covered with the insulating member 33 and the heat insulating member 34. A heat pipe 38 and an electrolytic solution (not shown) are housed and sealed with a lid member. The storage battery pair 21 is configured such that the second side surface portions 22c of each of the two storage batteries 20 are close to each other.

In the end region of one of the winding bodies 30 in the horizontal axis direction (the third side surface portion 22d side of the case 22), the positive electrode current collecting tab 31 connected to the positive electrode plate 30a extends upward and the positive electrode terminal 23 in the case 22. It is connected to the. In the other end region of the winding body 30 in the horizontal axis direction (the fourth side surface portion 22e side of the case 22), the negative electrode current collecting tab 32 connected to the negative electrode plate 30b extends upward and the negative electrode terminal 24 in the case 22. It is connected to the. Further, the winding body 30 has a pair of flat and substantially parallel flat plane portions occupying a large area of the outer peripheral portion on the first side surface portion 22b side and the second side surface portion 22c side of the outer peripheral portion.

The insulating member 33 that covers the outer periphery of the winding body 30 is made of a synthetic resin material (for example, polypropylene or polyethylene) and is formed in a flexible sheet shape. In the winding body 30 covered with the insulating member 33, at least a majority region of the outer periphery thereof is covered with the sheet-shaped heat insulating member 34, and both ends in the horizontal axial direction may also be covered with the insulating member 33. A sheet shape for warming the winding body 30 from the uneven surface portion in a region between the heat insulating member 34 and the insulating member 33 and close to the uneven flat surface portion on the first side surface portion 22b side of the winding body 30. The heater 35 of the above is arranged.

Although not shown, the insulating member 33 that covers the outer periphery of the winding body 30 has an accommodating portion for accommodating the heater 35 in a region that abuts on the flat surface portion of the winding body 30 on the first side surface portion 22b side. It is formed in the shape of a bag. The heater 35 is housed in this housing portion in a sealed manner, and the heater 35 does not come into direct contact with the electrolytic solution and the winding body 30. The power lines 35a and 35b of the heater 35 extend to the outside of the accommodating portion and are connected to the positive electrode terminal 23 and the negative electrode terminal 24, respectively. The accommodating portion of the heater 35 can also be formed on the heat insulating member 34. Further, the heater 35 sandwiched and sealed with an insulating film made of synthetic resin is arranged in a region close to the eccentric flat portion on the second side surface portion 22c side of the winding body 30 and is covered and held by the heat insulating member 34. You can also do it.

The heater 35 is configured to generate Joule heat when energized, and a pair of power lines 35a and 35b are connected to the positive electrode terminal 23 and the negative electrode terminal 24 of the storage battery 20, respectively. The power line 35a is connected to the positive electrode terminal 23 via a temperature switch 25 arranged on the upper surface portion 22a. The temperature switch 25 is switched so as to be energized at a temperature lower than a predetermined temperature, and operates by detecting the temperature of the upper surface portion 22a or the temperature inside the case 22 as the temperature of the storage battery 20. As a result, the storage battery 20 operates the heater 35 by the electric power stored in itself to maintain a predetermined temperature. The predetermined temperature is, for example, −20 ° C., and is appropriately set according to the specifications of the storage battery 20 (lower limit value in the operating temperature range).

The resistance value of the heater 35 is set so that the winding body 30 covered with the heat insulating member 34 can maintain a predetermined temperature by the Joule heat and the self-heating of the storage battery 20 that supplies electric power when the heater 35 is operated. .. For example, in order for the storage battery 20 to maintain −20 ° C. in an environment of −30 ° C., the resistance value of the heater 35 is set so that the amount of heat generated by the heater 35 and the amount of heat dissipated from the case 22 are balanced. Since the amount of heat radiation varies depending on the specifications of the storage battery 20, this resistance value is appropriately set according to the specifications of the storage battery 20. As a result, the power consumption of the heater 35 is minimized and the decrease in SOC is moderated.

The heat insulating member 34 is formed by forming, for example, a silica airgel-based porous hollow structure into a flexible sheet shape so that the hollow structure is closed to the outside, and the wound body 30 is more than the insulating member 33. It has a high effect of suppressing heat conduction between the cases 22, and has insulating properties without infiltration of the electrolytic solution.

The storage battery 20 includes a sheet-shaped heat pipe 38 having a pair of heat absorbing portions 36a and 36b and a heat radiating portion 37 and having flexibility. The pair of heat absorbing portions 36a and 36b are eccentric flat portions on the second side surface portion 22c side of the winding body 30 covered with the insulating member 33 inside the heat insulating member 34, and are portions on both ends in the horizontal axis direction. Is in contact with. The pair of heat absorbing portions 36a and 36b extend to the outside of the heat insulating member 34 toward the inner wall of the bottom surface portion 22f of the case 22, and extend to the first side surface portion 22b along the inner wall of the bottom surface portion 22f on the outside of the heat insulating member 34. It extends toward and is connected to the heat radiating portion 37 that abuts on the inner wall of the first side surface portion 22b of the case 22. The pair of endothermic portions 36a and 36b are also in contact with the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32, respectively. A wick that causes a hydraulic fluid and a capillary phenomenon of the hydraulic fluid is enclosed in the heat pipe 38. The surface of the heat pipe 38 is covered with an insulating protective film for protecting the surface from the electrolytic solution.

The hydraulic fluid vaporized by absorbing the heat of the winding body 30, the positive electrode current collecting tab 31 and the negative electrode current collecting tab 32 in the endothermic portions 36a and 36b moves to the heat radiating portion 37 having a lower atmospheric pressure than the heat absorbing portions 36a and 36b. .. The hydraulic fluid condensed and liquefied by the heat radiation in the heat radiation unit 37 returns to the heat absorption units 36a and 36b due to the capillary phenomenon. In order to circulate the hydraulic fluid that changes phase in this way and make the heat pipe 38 function, it is preferable that the area of the heat radiating portion 37 is 10 times or more the total area of the heat absorbing portions 36a and 36b. Therefore, by forming the heat radiating portion 37 so as to be in contact with substantially the entire area of the inner wall of the first side surface portion 22b having the largest side surface area of the case 22, the heat radiating region of the heat radiating portion 37 is sufficiently large. The heat pipe 38 is functioning. Further, the heat radiating portion 37 is pressed against the inner wall of the first side surface portion 22b of the case 22 by the winding body 30 to be in close contact with the heat radiating portion 37, and heat is smoothly transferred from the heat radiating portion 37 to the second side surface portion 22c.

A positive electrode current collecting tab 31 and a negative electrode current collecting tab 32 are arranged at both ends of the winding body 30 in the horizontal axis direction, so that the current is concentrated, so that the temperature becomes high during charging and discharging. The heat pipe 38 absorbs this heat by the heat absorbing portions 36a and 36b inside the heat insulating member 34 and transfers the heat to the first side surface portion 22b by the heat radiating portion 37 outside the heat insulating member 34 to dissipate heat. Since the heat radiated from the first side surface portion 22b is promoted by the cooling air passing through the cooling air passage 17, the heat pipe 38 can steadily transfer the heat of the winding body 30 to the outside to cool the storage battery 20. can. Further, the intermediate portion between the heat absorbing portions 36a and 36b and the heat radiating portion 37 is brought into contact with the inner wall of the bottom surface portion 22f of the case 22 to secure a larger heat radiating region, and the cooling air passing near the bottom surface portion 22f is also used to dissipate heat. May be promoted.

The heat pipe 38 absorbs heat from the winding body 30 even at a low temperature at which the heater 35 operates. Therefore, a temperature gradient is generated in the winding body 30 so as to promote heat transfer between the heater 35 on the first side surface portion 22b side of the case 22 and the heat absorbing portions 36a and 36b on the second side surface portion 22c side, and the winding body is wound. The whole body 30 is easier to warm up.

As shown in FIG. 6, the heat pipe 38 extends from the pair of heat absorbing portions 36a and 36b toward the inner walls of the third side surface portion 22d and the fourth side surface portion 22e, respectively, to the outside of the heat insulating member 34, and the third and fourth heat pipes 38 It may extend along the inner wall of the side surface portions 22d and 22e toward the inner wall of the first side surface portion 22b and be connected to the heat radiating portion 37. Further, the heat radiating portion 37 may be extended so as to abut on the inner wall of the bottom surface portion 22f of the case 22.

Based on the temperature data of the temperature sensor 7, the ECU 8 controls cooling by the blower fan 5 so that the power storage device 10 can exhibit its performance within a predetermined operating temperature range. For example, when the temperature sensor 7 detects a temperature equal to or higher than the upper limit temperature of the operating temperature range (for example, 60 ° C.) or is predicted to exceed the upper limit temperature from the degree of increase in the detected temperature, the ECU 8 detects the upper limit of the operating temperature range. The blower fan 5 is operated so as to maintain a temperature lower than the temperature, or the amount of blown air thereof is increased. The blower fan 5 may also use the blower fan of the cooling mechanism of the engine 2 for cooling the power storage device 10, or may be a blower fan dedicated to the power storage device 10.

An example of a large-capacity vehicle power storage device that supplies electric power for driving an EV will be described. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
As shown in FIG. 7, the EV includes an electric motor 52 for driving a vehicle, a braking device 53, various sensors including a vehicle speed sensor 54, a temperature sensor 55, etc., a cooling fan 56, and DC power supplied to these as a vehicle side load 51. It is equipped with a DCDC converter 57 or the like for adjusting the voltage of the above. It also includes a power storage device 50 (vehicle power storage device) that stores electric power for driving the vehicle to be supplied to the vehicle side load 51, and a control unit (ECU 58) that controls the vehicle side load 51 and the power storage device 50.

The temperature sensor 55 detects the temperature of the power storage device 50. The cooling fan 56 blows cooling air for cooling the power storage device 50. The ECU 58 is composed of a computer including a CPU, a memory for storing various programs, an input / output device, and the like. The ECU 58 processes signals periodically output from various sensors, and outputs control signals for appropriately operating the power storage device 50, the electric motor 52, the braking device 53, the cooling fan 56, and the like. The ECU 58 manages the charging state (SOC) of the power storage device 50, and notifies the driver of the current SOC, the mileage, and the like.

Next, the power storage device 50 will be described.
As shown in FIG. 8, the power storage device 50 has a support panel member 61 and a cover member so as to ensure vibration resistance (rigidity) and water resistance (waterproofness) for being arranged in the space below the floor panel of the EV vehicle. It is housed in a power storage device case 60 composed of 62. In the figure, the arrow U indicates upward, the arrow F indicates the front of the vehicle, and the arrow L indicates the left side of the vehicle. The heat generated from the power storage device 50 is introduced into the power storage device case 60 from the front side along the support panel member 61 by a cooling fan 56 (not shown), and is discharged to the rear by the cooling air. It is discharged to the outside of the case 60.

The power storage device 50 is configured to connect a plurality of power storage modules M1 to Mn in series by a plurality of bus bars 59 to supply electric power for driving an EV vehicle. The number of power storage modules mounted on the power storage device 50 is appropriately set according to the specifications of the EV on which the power storage device 50 is mounted.

Since the power storage modules M1 to Mn have the same configuration, the power storage module M1 will be described, and the description of the other power storage modules M2 to Mn will be omitted.
As shown in FIG. 9, the power storage module M1 comprises a storage battery pair 71 in which two square lithium ion secondary batteries (storage batteries 70a and 70b) are placed close to each other via an insulating separator 13, and six storage batteries are formed. It has a pair 71. A pair of support members 72 and a pair of end plates 73 are connected so as to maintain a state in which the six storage battery pairs 71 are aligned horizontally in a row with a predetermined interval (for example, an interval of 10 mm). And fixed.

Between the storage battery pairs 71, a pair of support members 72 are equipped with a plurality of spacer members 72a for maintaining a predetermined interval and securing a cooling air passage 17. A passage through which cooling air passes is also provided between the end plate 73 and the storage battery pair 71. The storage batteries 70a and 70b of the storage battery pair 71 are connected in parallel by the plurality of bus bars 74, and the plurality of storage battery pairs 71 are connected in series, and the positive electrode terminal 75 and the negative electrode terminal 76 of the power storage module M1 are provided at both ends thereof. ..

As shown in FIGS. 3 to 5, one of the storage batteries 70a of the storage battery pair 71 has a rectangular parallelepiped case 22, and the positive electrode terminal 23 and the negative electrode terminal 24 of the storage battery 70a are arranged on the upper surface portion 22a. The storage battery 70a has a first side surface portion 22b and a second side surface portion 22c having the maximum side surface area parallel to each other, and a third side surface portion 22d orthogonal to and parallel to the first and second side surface portions 22b and 22c. It also has a fourth side surface portion 22e and a bottom surface portion 22f facing the upper surface portion 22a.

Inside the case 22, the positive electrode plate 30a and the negative electrode plate 30b are wound flat around the horizontal axis via a porous separator 30c, and the outer periphery is covered with an insulating member 33 and a heat insulating member 34. A heater 35, a heat pipe 38 having heat absorbing portions 36a and 36b and a heat radiating portion 37, and an electrolytic solution (not shown) are housed and sealed with a lid member. The heat pipe 38 is a flat surface portion on the second side surface portion 22c side of the winding body 30 in which the heat absorbing portions 36a and 36b are covered with the insulating member 33 inside the heat insulating member 34, and is a portion on both ends in the horizontal axis direction. The heat radiating portion 37 is in contact with the inner wall of the first side surface portion 22b of the case 22. The internal structure of the storage battery 70a is the same as that of the storage battery 20 of the first embodiment.

Since the other storage battery 70b of the storage battery pair 71 has a symmetrical structure with the storage battery 70a and the second side surface portion 22c as symmetrical planes, the description thereof will be omitted, but the second side surface portions 22c of the storage batteries 70a and 70b are placed close to each other. A storage battery pair 71 is configured. The first side surface portion 22b with which the heat radiating portions 37 of the heat pipes 38 of the storage batteries 70a and 70b are in contact faces the cooling air passages 17 formed at predetermined intervals between the plurality of storage battery pairs 71, and the cooling air is cooled. The cooling air passing through the passage 17 promotes heat dissipation from the first side surface portion 22b.

As shown in FIGS. 8 to 10, the power storage module M1 is placed at a predetermined position of the support panel member 61, and is fastened and fixed to the support panel member 61 by, for example, a fastening member (not shown). At this time, between the plurality of storage battery pairs 71 on the lower side of the power storage module M1 and the support panel member 61, the cooling air supply passage 77 that supplies cooling air from between the pair of support members 72 to the cooling air passage 17. Is formed. The cooling air from the cooling air supply passage 77 flows through the cooling air passage 17 between the storage battery pairs 71 from the lower side to the upper side.

Based on the temperature data of the temperature sensor 55, the ECU 58 controls cooling so that the power storage device 50 can exhibit its performance within a predetermined operating temperature range. For example, when the temperature sensor 55 detects a temperature equal to or higher than the upper limit temperature in the operating temperature range (for example, 60 ° C.) or is predicted to exceed the upper limit temperature from the rising mode of the detected temperature, the upper limit temperature in the operating temperature range is predicted. The cooling fan 56 is operated to maintain a lower temperature, or the amount of air blown thereof is increased.

Next, the operation and effect of the present invention will be described.
Since the outer circumference of the winding body 30 whose outer circumference is covered by the insulating member 33 is covered by the heat insulating member 34, the storage batteries 20 (70a, 70b) having the winding body 30 are affected by the temperature outside the heat insulating member 34. Is reduced. Further, the heater 35 arranged between the heat insulating member 34 and the winding body 30 can heat the winding body 30 from a wide flat surface portion, and the heat of the heater 35 is not released by the heat insulating member 34. .. Moreover, since the heat pipe 38 absorbs heat even at a low temperature at which the heater 35 operates, winding is performed between the heater 35 on the first side surface portion 22b side of the case 22 and the heat absorbing portions 36a and 36b on the second side surface portion 22c side. A temperature gradient that promotes heat transfer is generated in the winding body 30, and the entire winding body 30 is more likely to be warmed. Moreover, when the winding body 30 becomes hot due to charging / discharging, the heat can be transferred to the first side surface portion 22b of the case 22 by the heat pipe 38. Therefore, the storage battery 20 (70a, 70b) can be efficiently heated and cooled.

Further, since the heat pipe 38 is brought into contact with the inner wall of the bottom surface portion 22f and the inner walls of the third and fourth side surface portions 22d and 22e to secure a large heat dissipation area, efficient cooling can be realized by the heat pipe 38. Moreover, since the first side surface portion 22b with which the heat radiation portion 37 of the heat pipe 38 abuts faces the cooling air passage 17, cooling from the second side surface portion 22c can be promoted.

An example of a power storage device 10 for an auxiliary device 3 of a vehicle traveling by an engine 2 and an example of a power storage device 50 for traveling an EV have been described, but the configuration is as a power storage device for a hybrid vehicle traveling by using an engine and an electric motor. It is also possible to do. In addition, a person skilled in the art can carry out the embodiment in which various modifications are added to the above embodiment without departing from the spirit of the present invention, and the present invention also includes such modifications.

2: Engine 3: Auxiliary equipment 5: Blower fan 7: Temperature sensor 8: ECU
10: Power storage device 17: Cooling air passage 20: Storage battery 21: Storage battery pair 22: Case 22b: First side surface portion 22c: Second side surface portion 22d: Third side surface portion 22e: Fourth side surface portion 22f: Bottom portion 30: Winding Rotating body 30a: Positive electrode plate 30b: Negative electrode plate 30c: Separator 33: Insulating member 34: Insulating member 35: Heater 36a, 36b: Heat absorbing part 37: Dissipating part 38: Heat pipe 50: Power storage device 51: Vehicle side load 52: Electric Motor 55: Temperature sensor 56: Cooling fan 58: ECU
70a, 70b: Storage battery 71: Storage battery pair 77: Cooling air supply passage M1 to Mn: Power storage module

Claims (4)

In a vehicle power storage device equipped with multiple storage batteries having a rectangular parallelepiped case,
The case has a first side surface portion and a second side surface portion having the maximum side surface area.
The storage battery includes a winding body in which a positive electrode plate and a negative electrode plate are wound flat around a horizontal axis via a separator and the outer periphery is covered with an insulating member, and a heat insulating member covering the outer periphery of the winding body. , A sheet-shaped heater disposed between the eccentric flat portion on the first side surface portion side and the heat insulating member of the pair of eccentric flat portions of the winding body, and the deviation on the second side surface portion side. The case is characterized in that a heat pipe having a pair of heat absorbing portions abutting on both end portions in the horizontal axis direction of the flat surface portion and a heat radiating portion abutting on the inner wall of the first side surface portion is housed in the case. Vehicle power storage device. The vehicle according to claim 1, wherein the heat pipe abuts on the inner surface of the bottom surface portion of the case from the pair of heat absorbing portions, extends toward the first side surface portion, and is connected to the heat radiating portion. Power storage device. The heat pipe abuts on the inner surfaces of the third side surface portion and the fourth side surface portion of the case orthogonal to the horizontal axis of the winding body from the pair of heat absorbing portions toward the first side surface portion. The vehicle power storage device according to claim 1, wherein the power storage device extends and is connected to the heat dissipation unit. Cooling formed by having a plurality of storage battery pairs consisting of a pair of the storage batteries in which the second side surface portions are brought into close contact with each other, and arranging the storage battery pairs in a horizontal row at predetermined intervals. The vehicle power storage device according to any one of claims 1 to 3, wherein the first side surface portion is configured to face the wind passage.

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